From: dE <de.techno@gmail.com>
To: Alsa-devel@alsa-project.org
Subject: Re: What are subdevices?
Date: Sun, 26 Oct 2014 15:27:32 +0530 [thread overview]
Message-ID: <544CC58C.3080800@gmail.com> (raw)
In-Reply-To: <544CBACF.2080702@ladisch.de>
On 10/26/14 14:41, Clemens Ladisch wrote:
> dE wrote:
>> A device seems like the output streams the sound card supports. Like HDMI, DP, analog etc...
>>
>> So what's a subdevice?
> A subdevice is an output streams the sound card supports.
>
> Typically, a device has multiple subdevices if the card supports hardware mixing; all
> the subdevices end up at the same physical output.
>
>
> Regards,
> Clemens
Ok, so a device list is a list of different streams the card can
supports simultaneously and they'll be output via different channels
without mixing.
Thanks for clarifying this.
But, typically cards have a single analog device but support
multichannel output. So how does this work at the software level? If
ALSA can't send multiple streams of audio to one device, then how does
ALSA send separate output to different channels of the device?
Is the PCM sent to the sound card codified? Is this the same way how
stereo work?
next prev parent reply other threads:[~2014-10-26 9:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-26 8:14 What are subdevices? dE
2014-10-26 9:11 ` Clemens Ladisch
2014-10-26 9:57 ` dE [this message]
2014-10-27 18:02 ` dE
2014-10-27 19:46 ` Clemens Ladisch
2014-10-28 3:17 ` dE
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